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Free UUID Generator (v4)

Generate one or up to 100 version-4 UUIDs at once. Cryptographically random, runs entirely in your browser via the native crypto.randomUUID() API. Output in lowercase, uppercase, with braces, or with dashes stripped.

UUID v4 generated locally using crypto.randomUUID(). Browser-native, cryptographically random.

What is a UUID?

A UUID is a 128-bit identifier designed to be unique across all systems without central coordination. Probability of two randomly-generated v4 UUIDs colliding is so low it would take generating billions per second for a hundred years to expect even one collision.

Common uses include primary keys in databases, session IDs, request tracing identifiers, file names that must be guaranteed unique, and entity IDs in distributed systems.

Format reference

A standard UUID looks like 550e8400-e29b-41d4-a716-446655440000 — 32 hex digits broken into 5 groups by hyphens (8-4-4-4-12). The 13th digit always shows the version (here4), and the 17th encodes the variant.

Frequently asked questions

A UUID (Universally Unique Identifier) is a 128-bit value typically written as 32 hex digits with hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000. UUIDs are designed to be unique without coordination between systems — collision odds are astronomically low.

Version 4 — random UUIDs. The bits are generated using crypto.randomUUID(), which uses a cryptographically secure RNG. 122 of the 128 bits are random; 6 are version + variant identifiers.

They are sufficiently random for use as session IDs, API keys, or one-time tokens — about 122 bits of entropy. For dedicated secret keys (signing, encryption), prefer our api-key generator or aes-key generator which produce purpose-shaped output.

They are the same thing. "GUID" (Globally Unique Identifier) is Microsoft's name for it; "UUID" is the original IETF name. Format is identical.

Yes. UUIDs are generated in your browser using the built-in crypto.randomUUID() API. Nothing is sent to a server.

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